I learned the flutter as a by product of learning to isolate the tummy muscles for a belly roll.
My first instructor used to have us lay on the floor on our backs, lightly laying one hand on the lower abdomen, the other on the diaphragm. Then we'd practice pushing out and pulling in the diaphragm muscles with an even rythm. Then repeat using the lower abdominal muscles. This helped strengthen those muscles and our control over them. Then we'd flex and release the diaphragm then lower abdomen one after the other. By lying on our backs we didn't have to worry about posture or any other muscles.
Because I had been practicing the belly roll that way I discovered that I had developed very strong control over the diaphragm muscle and could easily do the flutter as well as hold it for a fairly long period of time. I'm pretty much only limited in my flutter by the length of time I can go without breathing...LOL!
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